linux-kernel - Re: [PATCH v6 10/25] iommufd/viommu: Add IOMMUFD_CMD_HW_QUEUE

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Message-ID: <8b57d3fb-bc0c-4ab6-8a53-22d93718b422@linux.intel.com>
Date: Mon, 16 Jun 2025 15:11:37 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Nicolin Chen <nicolinc@...dia.com>, jgg@...dia.com, kevin.tian@...el.com,
 corbet@....net, will@...nel.org
Cc: bagasdotme@...il.com, robin.murphy@....com, joro@...tes.org,
 thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
 shuah@...nel.org, jsnitsel@...hat.com, nathan@...nel.org,
 peterz@...radead.org, yi.l.liu@...el.com, mshavit@...gle.com,
 praan@...gle.com, zhangzekun11@...wei.com, iommu@...ts.linux.dev,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
 linux-kselftest@...r.kernel.org, patches@...ts.linux.dev, mochs@...dia.com,
 alok.a.tiwari@...cle.com, vasant.hegde@....com, dwmw2@...radead.org
Subject: Re: [PATCH v6 10/25] iommufd/viommu: Add IOMMUFD_CMD_HW_QUEUE_ALLOC
 ioctl

On 6/14/25 15:14, Nicolin Chen wrote:
> Introduce a new IOMMUFD_CMD_HW_QUEUE_ALLOC ioctl for user space to allocate
> a HW QUEUE object for a vIOMMU specific HW-accelerated queue, e.g.:
>   - NVIDIA's Virtual Command Queue
>   - AMD vIOMMU's Command Buffer, Event Log Buffers, and PPR Log Buffers
> 
> Since this is introduced with NVIDIA's VCMDQs that access the guest memory
> in the physical address space, add an iommufd_hw_queue_alloc_phys() helper
> that will create an access object to the queue memory in the IOAS, to avoid
> the mappings of the guest memory from being unmapped, during the life cycle
> of the HW queue object.
> 
> Reviewed-by: Pranjal Shrivastava<praan@...gle.com>
> Reviewed-by: Kevin Tian<kevin.tian@...el.com>
> Signed-off-by: Nicolin Chen<nicolinc@...dia.com>

Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>